1004ron Posted October 26, 2024 Report Share Posted October 26, 2024 Installed the new NGK's this morning. The old plugs looked very good and no change in gap - just thought that there may be benefits with the revised heat range plugs. Looked into the cylinders and they're all pristine, like brand new. 2 Quote Link to comment Share on other sites More sharing options...
boostededge Posted December 30, 2024 Author Report Share Posted December 30, 2024 (edited) Edited because I'm even more confused now. Using the NGK part finder is looks like OEM plugs were heat range 7? and the now NGK recommended plugs are heat range 6 wheras Ford is recommending a hotter plug heat range 8 possibly on SP-578? Going to that hot of a plug doesn't sound good, I can see why people would see less timing and be able to run less boost. @1004ron you originally installed the LTR7BHX which are heat range 7 now your going to a COLDER plug LTR6BHX heat range 6. Ford SP-542 is heat range 7 SP-578 is heat range ?8? Iridium NGK ILTR7N8 is heat range 7 (original OEM equivalent) NGK ILTR6S8 is heat range 6 Ruthenium NGK LTR7BHX is heat range 7 NGK LTR6BHX is heat range 6 Edited December 30, 2024 by boostededge 1 Quote Link to comment Share on other sites More sharing options...
1004ron Posted December 30, 2024 Report Share Posted December 30, 2024 NGK 6 is hotter than NGK 7. NGK.com: Heat Range Conversion Chart Quote Link to comment Share on other sites More sharing options...
boostededge Posted December 30, 2024 Author Report Share Posted December 30, 2024 7 minutes ago, 1004ron said: NGK 6 is hotter than NGK 7. NGK.com: Heat Range Conversion Chart Thanks I had it backwards! Quote Link to comment Share on other sites More sharing options...
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